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<div id=Content><div class="CClass"><div class=CTopic id=MainTopic><h1 class=CTitle><a name="OpenLayers.Tile.Image"></a>OpenLayers.<wbr>Tile.<wbr>Image</h1><div class=CBody><p>Instances of OpenLayers.Tile.Image are used to manage the image tiles used by various layers.&nbsp;  Create a new image tile with the <a href="#OpenLayers.Tile.Image.OpenLayers.Tile.Image" class=LConstructor id=link18 onMouseOver="ShowTip(event, 'tt1', 'link18')" onMouseOut="HideTip('tt1')">OpenLayers.Tile.Image</a> constructor.</p><h4 class=CHeading>Inherits from</h4><ul><li><a href="../../deprecated-js.html#OpenLayers.Tile" class=LClass >OpenLayers.Tile</a></li></ul><!--START_ND_SUMMARY--><div class=Summary><div class=STitle>Summary</div><div class=SBorder><table border=0 cellspacing=0 cellpadding=0 class=STable><tr class="SMain"><td class=SEntry><a href="#OpenLayers.Tile.Image" >OpenLayers.<wbr>Tile.<wbr>Image</a></td><td class=SDescription>Instances of OpenLayers.Tile.Image are used to manage the image tiles used by various layers. </td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Tile.Image.Properties" >Properties</a></td><td class=SDescription></td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.events" >events</a></td><td class=SDescription>{<a href="../Events-js.html#OpenLayers.Events" class=LClass >OpenLayers.Events</a>} An events object that handles all events on the tile.</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.url" >url</a></td><td class=SDescription>{String} The URL of the image being requested. </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.imgDiv" >imgDiv</a></td><td class=SDescription>{HTMLImageElement} The image for this tile.</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.frame" >frame</a></td><td class=SDescription>{DOMElement} The image element is appended to the frame. </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.imageReloadAttempts" >imageReloadAttempts</a></td><td class=SDescription>{Integer} Attempts to load the image.</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.layerAlphaHack" >layerAlphaHack</a></td><td class=SDescription>{Boolean} True if the png alpha hack needs to be applied on the layer&rsquo;s div.</td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.asyncRequestId" >asyncRequestId</a></td><td class=SDescription>{Integer} ID of an request to see if request is still valid. </td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.maxGetUrlLength" >maxGetUrlLength</a></td><td class=SDescription>{Number} If set, requests that would result in GET urls with more characters than the number provided will be made using form-encoded HTTP POST. </td></tr><tr class="SProperty SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.canvasContext" >canvasContext</a></td><td class=SDescription>{CanvasRenderingContext2D} A canvas context associated with the tile image.</td></tr><tr class="SProperty SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.crossOriginKeyword" >crossOriginKeyword</a></td><td class=SDescription>The value of the crossorigin keyword to use when loading images. </td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Tile.Image.Constructor" >Constructor</a></td><td class=SDescription></td></tr><tr class="SConstructor SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.OpenLayers.Tile.Image" >OpenLayers.<wbr>Tile.<wbr>Image</a></td><td class=SDescription>Constructor for a new <a href="#OpenLayers.Tile.Image.OpenLayers.Tile.Image" class=LConstructor id=link1 onMouseOver="ShowTip(event, 'tt1', 'link1')" onMouseOut="HideTip('tt1')">OpenLayers.Tile.Image</a> instance.</td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Tile.Image.Functions" >Functions</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.destroy" id=link2 onMouseOver="ShowTip(event, 'tt2', 'link2')" onMouseOut="HideTip('tt2')">destroy</a></td><td class=SDescription>nullify references to prevent circular references and memory leaks</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.draw" id=link3 onMouseOver="ShowTip(event, 'tt3', 'link3')" onMouseOut="HideTip('tt3')">draw</a></td><td class=SDescription>Check that a tile should be drawn, and draw it.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.renderTile" id=link4 onMouseOver="ShowTip(event, 'tt4', 'link4')" onMouseOut="HideTip('tt4')">renderTile</a></td><td class=SDescription>Internal function to actually initialize the image tile, position it correctly, and set its url.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.positionTile" id=link5 onMouseOver="ShowTip(event, 'tt5', 'link5')" onMouseOut="HideTip('tt5')">positionTile</a></td><td class=SDescription>Using the properties currenty set on the layer, position the tile correctly. </td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.clear" id=link6 onMouseOver="ShowTip(event, 'tt6', 'link6')" onMouseOut="HideTip('tt6')">clear</a></td><td class=SDescription>Remove the tile from the DOM, clear it of any image related data so that it can be reused in a new location.</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.getImage" id=link7 onMouseOver="ShowTip(event, 'tt7', 'link7')" onMouseOut="HideTip('tt7')">getImage</a></td><td class=SDescription>Returns or creates and returns the tile image.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.setImage" id=link8 onMouseOver="ShowTip(event, 'tt8', 'link8')" onMouseOut="HideTip('tt8')">setImage</a></td><td class=SDescription>Sets the image element for this tile. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.initImage" id=link9 onMouseOver="ShowTip(event, 'tt9', 'link9')" onMouseOut="HideTip('tt9')">initImage</a></td><td class=SDescription>Creates the content for the frame on the tile.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.setImgSrc" id=link10 onMouseOver="ShowTip(event, 'tt10', 'link10')" onMouseOut="HideTip('tt10')">setImgSrc</a></td><td class=SDescription>Sets the source for the tile image</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.getTile" id=link11 onMouseOver="ShowTip(event, 'tt11', 'link11')" onMouseOut="HideTip('tt11')">getTile</a></td><td class=SDescription>Get the tile&rsquo;s markup.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.createBackBuffer" id=link12 onMouseOver="ShowTip(event, 'tt12', 'link12')" onMouseOut="HideTip('tt12')">createBackBuffer</a></td><td class=SDescription>Create a backbuffer for this tile. </td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.onImageLoad" id=link13 onMouseOver="ShowTip(event, 'tt13', 'link13')" onMouseOut="HideTip('tt13')">onImageLoad</a></td><td class=SDescription>Handler for the image onload event</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.onImageError" id=link14 onMouseOver="ShowTip(event, 'tt14', 'link14')" onMouseOut="HideTip('tt14')">onImageError</a></td><td class=SDescription>Handler for the image onerror event</td></tr><tr class="SFunction SIndent2"><td class=SEntry><a href="#OpenLayers.Tile.Image.stopLoading" id=link15 onMouseOver="ShowTip(event, 'tt15', 'link15')" onMouseOut="HideTip('tt15')">stopLoading</a></td><td class=SDescription>Stops a loading sequence so <a href="#OpenLayers.Tile.Image.onImageLoad" class=LFunction id=link16 onMouseOver="ShowTip(event, 'tt13', 'link16')" onMouseOut="HideTip('tt13')">onImageLoad</a> won&rsquo;t be executed.</td></tr><tr class="SFunction SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.getCanvasContext" id=link17 onMouseOver="ShowTip(event, 'tt16', 'link17')" onMouseOut="HideTip('tt16')">getCanvasContext</a></td><td class=SDescription>Returns a canvas context associated with the tile image (with the image drawn on it). </td></tr><tr class="SGroup SIndent1"><td class=SEntry><a href="#OpenLayers.Tile.Image.Constants" >Constants</a></td><td class=SDescription></td></tr><tr class="SConstant SIndent2 SMarked"><td class=SEntry><a href="#OpenLayers.Tile.Image.OpenLayers.Tile.Image.IMAGE" >OpenLayers.<wbr>Tile.<wbr>Image.<wbr>IMAGE</a></td><td class=SDescription>{HTMLImageElement} The image for a tile.</td></tr></table></div></div><!--END_ND_SUMMARY--></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.Properties"></a>Properties</h3></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.events"></a>events</h3><div class=CBody><p>{<a href="../Events-js.html#OpenLayers.Events" class=LClass >OpenLayers.Events</a>} An events object that handles all events on the tile.</p><h4 class=CHeading>Register a listener for a particular event with the following syntax</h4><blockquote><pre class="prettyprint">tile.events.register(type, obj, listener);</pre></blockquote><h4 class=CHeading>Supported event types (in addition to the <a href="../../deprecated-js.html#OpenLayers.Tile" class=LClass >OpenLayers.Tile</a> events)</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>beforeload</td><td class=CDLDescription>Triggered before an image is prepared for loading, when the url for the image is known already.&nbsp; Listeners may call <a href="#OpenLayers.Tile.Image.setImage" class=LFunction id=link19 onMouseOver="ShowTip(event, 'tt8', 'link19')" onMouseOut="HideTip('tt8')">setImage</a> on the tile instance.&nbsp; If they do so, that image will be used and no new one will be created.</td></tr></table></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.url"></a>url</h3><div class=CBody><p>{String} The URL of the image being requested.&nbsp; No default.&nbsp; Filled in by layer.getURL() function.&nbsp; May be modified by loadstart listeners.</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.imgDiv"></a>imgDiv</h3><div class=CBody><p>{HTMLImageElement} The image for this tile.</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.frame"></a>frame</h3><div class=CBody><p>{DOMElement} The image element is appended to the frame.&nbsp;  Any gutter on the image will be hidden behind the frame.&nbsp; If no gutter is set, this will be null.</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.imageReloadAttempts"></a>imageReloadAttempts</h3><div class=CBody><p>{Integer} Attempts to load the image.</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.layerAlphaHack"></a>layerAlphaHack</h3><div class=CBody><p>{Boolean} True if the png alpha hack needs to be applied on the layer&rsquo;s div.</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.asyncRequestId"></a>asyncRequestId</h3><div class=CBody><p>{Integer} ID of an request to see if request is still valid.&nbsp; This is a number which increments by 1 for each asynchronous request.</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.maxGetUrlLength"></a>maxGetUrlLength</h3><div class=CBody><p>{Number} If set, requests that would result in GET urls with more characters than the number provided will be made using form-encoded HTTP POST.&nbsp; It is good practice to avoid urls that are longer than 2048 characters.</p><h4 class=CHeading>Caution</h4><p>Older versions of Gecko based browsers (e.g.&nbsp; Firefox &lt; 3.5) and most Opera versions do not fully support this option.&nbsp; On all browsers, transition effects are not supported if POST requests are used.</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.canvasContext"></a>canvasContext</h3><div class=CBody><p>{CanvasRenderingContext2D} A canvas context associated with the tile image.</p></div></div></div>

<div class="CProperty"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.crossOriginKeyword"></a>crossOriginKeyword</h3><div class=CBody><p>The value of the crossorigin keyword to use when loading images.&nbsp; This is only relevant when using <a href="#OpenLayers.Tile.Image.getCanvasContext" class=LFunction id=link20 onMouseOver="ShowTip(event, 'tt16', 'link20')" onMouseOut="HideTip('tt16')">getCanvasContext</a> for tiles from remote origins and should be set to either &lsquo;anonymous&rsquo; or &lsquo;use-credentials&rsquo; for servers that send Access-Control-Allow-Origin headers with their tiles.</p></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.Constructor"></a>Constructor</h3></div></div>

<div class="CConstructor"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.OpenLayers.Tile.Image"></a>OpenLayers.<wbr>Tile.<wbr>Image</h3><div class=CBody><p>Constructor for a new <a href="#OpenLayers.Tile.Image.OpenLayers.Tile.Image" class=LConstructor id=link21 onMouseOver="ShowTip(event, 'tt1', 'link21')" onMouseOut="HideTip('tt1')">OpenLayers.Tile.Image</a> instance.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>layer</td><td class=CDLDescription>{<a href="../Layer-js.html#OpenLayers.Layer" class=LClass >OpenLayers.Layer</a>} layer that the tile will go in.</td></tr><tr><td class=CDLEntry>position</td><td class=CDLDescription>{<a href="../BaseTypes/Pixel-js.html#OpenLayers.Pixel" class=LClass id=link22 onMouseOver="ShowTip(event, 'tt17', 'link22')" onMouseOut="HideTip('tt17')">OpenLayers.Pixel</a>}</td></tr><tr><td class=CDLEntry>bounds</td><td class=CDLDescription>{<a href="../BaseTypes/Bounds-js.html#OpenLayers.Bounds" class=LClass id=link23 onMouseOver="ShowTip(event, 'tt18', 'link23')" onMouseOut="HideTip('tt18')">OpenLayers.Bounds</a>}</td></tr><tr><td class=CDLEntry>url</td><td class=CDLDescription>{<a href="../BaseTypes-js.html#OpenLayers.String" class=LClass id=link24 onMouseOver="ShowTip(event, 'tt19', 'link24')" onMouseOut="HideTip('tt19')">String</a>} Deprecated.&nbsp; Remove me in 3.0.</td></tr><tr><td class=CDLEntry>size</td><td class=CDLDescription>{<a href="../BaseTypes/Size-js.html#OpenLayers.Size" class=LClass id=link25 onMouseOver="ShowTip(event, 'tt20', 'link25')" onMouseOut="HideTip('tt20')">OpenLayers.Size</a>}</td></tr><tr><td class=CDLEntry>options</td><td class=CDLDescription>{Object}</td></tr></table></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.Functions"></a>Functions</h3></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.destroy"></a>destroy</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">destroy: function()</td></tr></table></blockquote><p>nullify references to prevent circular references and memory leaks</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.draw"></a>draw</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">draw: function()</td></tr></table></blockquote><p>Check that a tile should be drawn, and draw it.</p><h4 class=CHeading>Returns</h4><p>{Boolean} Was a tile drawn?&nbsp; Or null if a beforedraw listener returned false.</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.renderTile"></a>renderTile</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">renderTile: function()</td></tr></table></blockquote><p>Internal function to actually initialize the image tile, position it correctly, and set its url.</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.positionTile"></a>positionTile</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">positionTile: function()</td></tr></table></blockquote><p>Using the properties currenty set on the layer, position the tile correctly.&nbsp; This method is used both by the async and non-async versions of the Tile.Image code.</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.clear"></a>clear</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">clear: function()</td></tr></table></blockquote><p>Remove the tile from the DOM, clear it of any image related data so that it can be reused in a new location.</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.getImage"></a>getImage</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">getImage: function()</td></tr></table></blockquote><p>Returns or creates and returns the tile image.</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.setImage"></a>setImage</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>setImage: function(</td><td class="PParameter  prettyprint " nowrap>img</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Sets the image element for this tile.&nbsp; This method should only be called from beforeload listeners.</p><p>Parameters img - {HTMLImageElement} The image to use for this tile.</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.initImage"></a>initImage</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">initImage: function()</td></tr></table></blockquote><p>Creates the content for the frame on the tile.</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.setImgSrc"></a>setImgSrc</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>setImgSrc: function(</td><td class="PParameter  prettyprint " nowrap>url</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Sets the source for the tile image</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>url</td><td class=CDLDescription>{String} or undefined to hide the image</td></tr></table></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.getTile"></a>getTile</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">getTile: function()</td></tr></table></blockquote><p>Get the tile&rsquo;s markup.</p><h4 class=CHeading>Returns</h4><p>{DOMElement} The tile&rsquo;s markup</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.createBackBuffer"></a>createBackBuffer</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">createBackBuffer: function()</td></tr></table></blockquote><p>Create a backbuffer for this tile.&nbsp; A backbuffer isn&rsquo;t exactly a clone of the tile&rsquo;s markup, because we want to avoid the reloading of the image.&nbsp; So we clone the frame, and steal the image from the tile.</p><h4 class=CHeading>Returns</h4><p>{DOMElement} The markup, or undefined if the tile has no image or if it&rsquo;s currently loading.</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.onImageLoad"></a>onImageLoad</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">onImageLoad: function()</td></tr></table></blockquote><p>Handler for the image onload event</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.onImageError"></a>onImageError</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">onImageError: function()</td></tr></table></blockquote><p>Handler for the image onerror event</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.stopLoading"></a>stopLoading</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">stopLoading: function()</td></tr></table></blockquote><p>Stops a loading sequence so <a href="#OpenLayers.Tile.Image.onImageLoad" class=LFunction id=link26 onMouseOver="ShowTip(event, 'tt13', 'link26')" onMouseOut="HideTip('tt13')">onImageLoad</a> won&rsquo;t be executed.</p></div></div></div>

<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.getCanvasContext"></a>getCanvasContext</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">getCanvasContext: function()</td></tr></table></blockquote><p>Returns a canvas context associated with the tile image (with the image drawn on it).&nbsp; Returns undefined if the browser does not support canvas, if the tile has no image or if it&rsquo;s currently loading.</p><p>The function returns a canvas context instance but the underlying canvas is still available in the &lsquo;canvas&rsquo; property:</p><blockquote><pre class="prettyprint">var context = tile.getCanvasContext();
if (context) {
    var data = context.canvas.toDataURL('image/jpeg');
}</pre></blockquote><h4 class=CHeading>Returns</h4><p>{Boolean}</p></div></div></div>

<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.Constants"></a>Constants</h3></div></div>

<div class="CConstant"><div class=CTopic><h3 class=CTitle><a name="OpenLayers.Tile.Image.OpenLayers.Tile.Image.IMAGE"></a>OpenLayers.<wbr>Tile.<wbr>Image.<wbr>IMAGE</h3><div class=CBody><p>{HTMLImageElement} The image for a tile.</p></div></div></div>

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<!--START_ND_TOOLTIPS-->
<div class=CToolTip id="tt1"><div class=CConstructor>Constructor for a new OpenLayers.Tile.Image instance.</div></div><div class=CToolTip id="tt2"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">destroy: function()</td></tr></table></blockquote>nullify references to prevent circular references and memory leaks</div></div><div class=CToolTip id="tt3"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">draw: function()</td></tr></table></blockquote>Check that a tile should be drawn, and draw it.</div></div><div class=CToolTip id="tt4"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">renderTile: function()</td></tr></table></blockquote>Internal function to actually initialize the image tile, position it correctly, and set its url.</div></div><div class=CToolTip id="tt5"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">positionTile: function()</td></tr></table></blockquote>Using the properties currenty set on the layer, position the tile correctly. </div></div><div class=CToolTip id="tt6"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">clear: function()</td></tr></table></blockquote>Remove the tile from the DOM, clear it of any image related data so that it can be reused in a new location.</div></div><div class=CToolTip id="tt7"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">getImage: function()</td></tr></table></blockquote>Returns or creates and returns the tile image.</div></div><div class=CToolTip id="tt8"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>setImage: function(</td><td class="PParameter  prettyprint " nowrap>img</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Sets the image element for this tile. </div></div><div class=CToolTip id="tt9"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">initImage: function()</td></tr></table></blockquote>Creates the content for the frame on the tile.</div></div><div class=CToolTip id="tt10"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters  prettyprint "nowrap>setImgSrc: function(</td><td class="PParameter  prettyprint " nowrap>url</td><td class="PAfterParameters  prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Sets the source for the tile image</div></div><div class=CToolTip id="tt11"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">getTile: function()</td></tr></table></blockquote>Get the tile&rsquo;s markup.</div></div><div class=CToolTip id="tt12"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">createBackBuffer: function()</td></tr></table></blockquote>Create a backbuffer for this tile. </div></div><div class=CToolTip id="tt13"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">onImageLoad: function()</td></tr></table></blockquote>Handler for the image onload event</div></div><div class=CToolTip id="tt14"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">onImageError: function()</td></tr></table></blockquote>Handler for the image onerror event</div></div><div class=CToolTip id="tt15"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">stopLoading: function()</td></tr></table></blockquote>Stops a loading sequence so onImageLoad won&rsquo;t be executed.</div></div><div class=CToolTip id="tt16"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td class="prettyprint">getCanvasContext: function()</td></tr></table></blockquote>Returns a canvas context associated with the tile image (with the image drawn on it). </div></div><div class=CToolTip id="tt17"><div class=CClass>This class represents a screen coordinate, in x and y coordinates</div></div><div class=CToolTip id="tt18"><div class=CClass>Instances of this class represent bounding boxes. </div></div><div class=CToolTip id="tt19"><div class=CClass>Contains convenience functions for string manipulation.</div></div><div class=CToolTip id="tt20"><div class=CClass>Instances of this class represent a width/height pair</div></div><!--END_ND_TOOLTIPS-->




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